diff --git a/stack-8.10.yaml b/stack-8.10.yaml
index defa3c5b6..3df09d7a6 100644
--- a/stack-8.10.yaml
+++ b/stack-8.10.yaml
@@ -59,7 +59,7 @@ compiler: ghc-8.10.0.20200123
 compiler-check: match-exact
 ###############################################################################
 
-resolver: lts-15.2
+resolver: lts-15.4
 
 packages:
 - hledger-lib
diff --git a/stack.yaml b/stack.yaml
index a1a49ac9d..ec8f23c24 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-# stack build plan using GHC 8.8.1
+# stack build plan using GHC 8.8.3
 
 nix:
   pure: false
@@ -7,7 +7,7 @@ nix:
 # stack seems to enable this by default now, basically disabling bounds checks. Force it off.
 #allow-newer: false
 #resolver: nightly-2020-01-31
-resolver: lts-15.2
+resolver: lts-15.4
 
 packages:
 - hledger-lib